Handle auth and validation api failed error

Author: rgodiyal

src/AddressValidation.php

@@ -66,7 +66,11 @@ public function validate(String $client_id, String $client_secret)
         $res = json_decode($response);
 
         if (!isset($res->XAVResponse)) {
-            $error = $res->response->errors[0]->message;
+            if (isset($res->response)) {
+                $error = $res->response->errors[0]->message;
+            } else {
+                $error = "Address Validation Failed! Please try again.";
+            }
             return ['status' => 'fail', 'msg' => $error];
         }
 

src/Auth.php

@@ -42,7 +42,11 @@ public function authenticate(String $client_id, String $client_secret)
         $res = json_decode($response);
 
         if (!isset($res->access_token)) {
-            $error = $res->response->errors[0]->message;
+            if (isset($res->response)) {
+                $error = $res->response->errors[0]->message;
+            } else {
+                $error = "Authentication Failed! Please try again.";
+            }
             return ['status' => 'fail', 'msg' => $error];
         }